Rock-drill chuck.



No. 69|,985. Patented Jan. 28, I902.

w. TERRY.

ROCK DRILL CHUCK.

(Application filed Apr. 12, 1901.\ (No Model.)

WITNESSES JNV ENTbR.

Z1. 7 ATTORNEY.

WILLIAM TERRY, OF OAKLAND, CALIFORNIA.

ROCK-DRILL CHUCK.

SPECIFICATION firming part of Letters Patent No. 691,985, dated January28, 1902. Application filed April 12,1901. Serial No. 55,577. (No model)T0 at whom it may concern.-

Be it known that I, WILLIAM TERRY, a citizen of the United States,residing at 515 Ninth street, Oakland, in the county of Alameda andState of California, have invented certain new and useful Improvementsin Rock- Drill Chucks, of which the following is a specification.

My invention relates td improvements in chucks for rock-drills, theobject of my invention being to provide means for holding the drill-bitfirmly in place in the chuck without the use of U-bolts such as are nowgenerally used. These U-bolts are very expen: sive, both in originalcost and to keep in repair, and are complicated, troublesome, andtedious to operate.

The object of my invention is to provide a simpler form of the devicefor holding the drill in place.

' Referring to the drawings, Figure 1 is a transverse section of thechuck, the drill-bit, the sleeve, and the block being removed therefrom.Fig. 2 is a longitudinal section at right angles to Fig. 1, showing thedrill-bit and the sleeve in place, the wedge removed, and the blockdisplaced from contact with the drill-bit. Fig. 3 is a perspective Viewof the sleeve. Fig. 4 is a transverse section on the line A A of Fig. 2looking in the direction of the arrow. Fig. 5 is a transverse section onthe line B B of Fig. 2, except that the wedge and block are shown inplace. Fig. 6 is a perspective view of the block.

Referring to the drawings, 1 represents the piston-rod, and 2 the chuck.Said chuck has formed therein an axial cylindrical socket or cavity 3.The lower side of said sockethas, however, an irregular extension, asshown at 4 in Fig. 2, to receive a sliding block 5. Said block 5 has asloping surface 6, resting upon a corresponding surface in the extension4; but the block 5 has its upper surface formed to fit close againstthree of the sides of the octagonal drill-bit 7, and in the upperportion of the socket 3 is placed a shell or sleeve 8, having its outersurface cylindrical to conform to the surface of the socket 3 and itsinner surface polyhedral to fit against the sides of the octagonal bit7. Said sleeve 8 is annular in form at its front or outer end, as shownat 9. In the central portion it is cut away to permit contact with theblock 5, and at its rear end it is formed with wings 10, havin g achannel 11 therebetween, in which channel 11 enters a short ridge orblock 12, formed on the lower surface of the cavity 3 to guide thesleeve to its proper position. Through the extension 4. of the socket 3is an aperture 13, extending entirely through said drillchuck, intowhich aperture projects a shoulder 14., formed on the block 5. A wedgeor key 15 is passed through said aperture 13 and abuts against theshoulder 14.. The efiect of forcing the wedge through said aperturetransversely to the chuck will be to cause the block 5 to moverearwardly in the socket 3, thereby also by reason of the coengagingfaces 6 forcing said block 5 inwardly or toward the axis of the chuckand against the drill-bit, thereby clamping said drill-bit and thesleeve 8 between said block 5 and the inner surface of the chuck. Byreason of the double wedging action exerted by the wedge 15 and theblock 5 the drill-bit 7 is very firmly held in place.

When it is desired to withdraw the drill bit, the wedge or key 5 isdriven out of the aperture 12, and then the block 5 is forced forward bymeans of a suitable pointed instrument 16, driven through a smalltransverse aperture 17 in the rear of the rear end of the block 5. Theannular front end of the sleeve 8 forms a solid support for the bit atthat point and prevents the same springing.

I claim 1. The combination of a chuck having an axial socket or cavityfor the drill-bit, said socket having a downward extension with asurface sloping upward rearwardly, a shell or sleeve fitting in thesocket, and provided with means for guiding the same into position, ablock in the lower part of the socket and having a rear upwardly-slopinglower surface to slide on the sloping surface of the extension and actas a wedge, said chuckbeing also apertured transversely through saidextension the block having a shoulder extending into said aperture, anda wedge or key in said transverse aperture engaging said shoulder toshift said block rearwardly and thereby clamp the drill-bit,substantially as described.

2. The combination of a chuck having an axial socket or cavity for thedrill-bit, said the chuck being also apertured transversely in the rearof the rear end of the block whereby-a suitable pointed instrument maybe inserted to remove or loosen the same; substantially as described.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

'WILLIAM TERRY.

Witnesses:

FRANCIS M. WRIGHT, WALLIS D. McPHERsoN.

